taliban claiming responsibilities. the attacker detonated explosives hidden in his turbin. he is the latest top ranking official killed in afghanistan. two week ago, hamid karzai's half brother was gunned down in his home. meantime, the state department warning the killing of usama bin laden could increase the terror threat to americans around the world. that's why officials are reiterating the warning today. the initial alert was set to expire next week. the warning describes ongoing attacks by al-qaida including suicide attacks, assassinations, kidnappings and hijackings. a law me want to help september 11th first responders with health coverage will not apply to people with cancer? a new government study says there's an insufficient link between toxins at ground zero and documented cancer cases. but that is not sitting well with many. >> i've been to 53 funerals. 51 are because the person died of cancer. >> the government will do another study on cancer cases next year. an update on the mother convicted of killing her 4-year-old son because she was jaywalking with him wh